$\left(-1\right)\:x\:\left(-1\right)\:x\:\left(2\right)\:x\:\left(-2\right)\:x\:\left(-2\right)\:x\:\left(2\right)\:$
$\lim_{x\to0}\left(\frac{2cos\left(2x\right)sin\left(2x\right)}{x^2}\right)$
$4a^2+24$
$-x^2-10x-24\ge0$
$4xy-yz^2;\:x=2;\:y=12;z=-3$
$5^x-3^{4y}=0$
$\left(\sqrt{x}^{2}-\sy\right)^{2}$
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